Method of controlling the reversing of a device for driving holes in earth and device for performing same
CA 1095021 A · Owner: Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr · Inventors: Kamensky, Veniamin V.; Tkach, Khaim B.; Kostylev, Alexandr D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of controlling the reversing of pneumatic reversible percussive devices for driving holes in earth wherein, in order to reverse the operation of the device from forward to reverse and vice versa the supply of com-, pressed air through the feed line is cut off. Then suction is generated in the feed line, whereby the operation of the device is reversed, whereafter the supply of compressed air is restored. The device performing the method of reversing of pneumatic reversible percussive devices for driving holes in earth includes a hollow housing accomodating therein a reciprocable impact member having a rear working chamber and defining with the housing a front working chamber within …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 3, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.